Effects of habitual physical activity on the resting metabolic rates and body compositions of women aged 35 to 50 years

Meredith Gilliat-Wimberly, Melinda M. Manore, Kathleen Woolf, Pamela D. Swan, Steven S. Carroll

Research output: Contribution to journalArticle

Abstract

Objective: To examine the effect habitual physical activity has on resting metabolic rate (RMR) and body composition (fat-free mass[FFM], fat mass, and percent body fat) in active compared to sedentary adult women. Design: RMR was measured (by indirect calorimetiy) twice after a 12-hour fast at the same point of the menstrual cycle and 48 hours after exercise. FFM, fat mass and percent body fat were measured using whole body air displacement plethysmography. Energy intake and expenditure were determined using 7-day weighed-food records and activity logs. Subjects: Healthy, weight-stable premenopausal women aged 35 to 50 years classified as either active (approximately 9 hours per week of physical activity for 10 or more years) (n=18) or sedentary (approximately 1 hour per week of physical activity) (n=14). Statistical analyses: Analysis of covariance was used to investigate differences in mean RMR (kcal/day) between the groups adjusted for FFM, and independent t tests were used to determine differences in demographic, energy expenditure, and diet variables. Results: Percent body fat and fat mass were lower (P<.0005) and RMR (adjusted for FFM) was significantly higher in the active women (P=.045) compared with sedentary controls. In the active and sedentary groups respectively, mean adjusted RMR was 1,510 kcal/day and 1,443 kcal/day, body fat was 18.9% and 28.8%, and fat mass was 11.1 kg and 18.8 kg. Groups were similar in body mass, FFM, body mass index, and age. Mean energy balance appeared to be more negative in the active group (P=.0059) due to significantly higher mean self-reported energy expenditures (P=.0001) and similar mean self-reported energy intakes (P=.52) compared with sedentary controls. These data indicate that active women who participate in habitual physical activity can maintain lower body fat and a higher RMR than sedentary controls with similar body mass, FFM, and body mass index. Applications/Conclusions: This research supports and emphasizes the benefits of habitual physical activity in maintaining RMR and lower body fat levels in middle-aged women.

Original languageEnglish (US)
Pages (from-to)1181-1188
Number of pages8
JournalJournal of the American Dietetic Association
Volume101
Issue number10
StatePublished - 2001

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Basal Metabolism
resting metabolic rate
Body Composition
physical activity
body composition
Fats
Exercise
body fat
Adipose Tissue
lipids
energy expenditure
Energy Metabolism
lean body mass
Energy Intake
body mass index
energy intake
Body Mass Index
middle-aged adults
menstrual cycle
research support

ASJC Scopus subject areas

  • Food Science
  • Medicine(all)

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Effects of habitual physical activity on the resting metabolic rates and body compositions of women aged 35 to 50 years. / Gilliat-Wimberly, Meredith; Manore, Melinda M.; Woolf, Kathleen; Swan, Pamela D.; Carroll, Steven S.

In: Journal of the American Dietetic Association, Vol. 101, No. 10, 2001, p. 1181-1188.

Research output: Contribution to journalArticle

Gilliat-Wimberly, Meredith ; Manore, Melinda M. ; Woolf, Kathleen ; Swan, Pamela D. ; Carroll, Steven S. / Effects of habitual physical activity on the resting metabolic rates and body compositions of women aged 35 to 50 years. In: Journal of the American Dietetic Association. 2001 ; Vol. 101, No. 10. pp. 1181-1188.
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abstract = "Objective: To examine the effect habitual physical activity has on resting metabolic rate (RMR) and body composition (fat-free mass[FFM], fat mass, and percent body fat) in active compared to sedentary adult women. Design: RMR was measured (by indirect calorimetiy) twice after a 12-hour fast at the same point of the menstrual cycle and 48 hours after exercise. FFM, fat mass and percent body fat were measured using whole body air displacement plethysmography. Energy intake and expenditure were determined using 7-day weighed-food records and activity logs. Subjects: Healthy, weight-stable premenopausal women aged 35 to 50 years classified as either active (approximately 9 hours per week of physical activity for 10 or more years) (n=18) or sedentary (approximately 1 hour per week of physical activity) (n=14). Statistical analyses: Analysis of covariance was used to investigate differences in mean RMR (kcal/day) between the groups adjusted for FFM, and independent t tests were used to determine differences in demographic, energy expenditure, and diet variables. Results: Percent body fat and fat mass were lower (P<.0005) and RMR (adjusted for FFM) was significantly higher in the active women (P=.045) compared with sedentary controls. In the active and sedentary groups respectively, mean adjusted RMR was 1,510 kcal/day and 1,443 kcal/day, body fat was 18.9{\%} and 28.8{\%}, and fat mass was 11.1 kg and 18.8 kg. Groups were similar in body mass, FFM, body mass index, and age. Mean energy balance appeared to be more negative in the active group (P=.0059) due to significantly higher mean self-reported energy expenditures (P=.0001) and similar mean self-reported energy intakes (P=.52) compared with sedentary controls. These data indicate that active women who participate in habitual physical activity can maintain lower body fat and a higher RMR than sedentary controls with similar body mass, FFM, and body mass index. Applications/Conclusions: This research supports and emphasizes the benefits of habitual physical activity in maintaining RMR and lower body fat levels in middle-aged women.",
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AU - Carroll, Steven S.

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